private void btn_AdminReg_Click(object sender, EventArgs e)
            {
            this.Hide();
            Admin_Login login = new Admin_Login(1);
            login.Show();
            }

public partial class Admin_Login : MetroFramework.Forms.MetroForm
{
    int separator;// this is used to separate different logins

    public Admin_Login(int value)
    {
        InitializeComponent();
        separator = value;
    }

    //------- Legend ---------
    //if separator= 1 : AdminTerminal
    //if separator= 2 : UpdatingTerminal
    //if separator= 3 : View Registration
    //if separator= 4 : Registration
    //if separator= 5 : Reports
    //if separator= 6 : Cancel Union

    static string path = Path.GetFullPath(Environment.CurrentDirectory);
    static string dataBaseName = "Trade_Union_Registration.mdf";

    private void Admin_Login_Load(object sender, EventArgs e)
    {


    }

    private void btn_Login_Click(object sender, EventArgs e)
    {
      // try
       // {
            if (separator == 1)
            {


                Data getTable = new Data();
                DataTable table = getTable.GetData("select  UserName,Password from SuperUser where UserName='" + txt_UserName.Text + "' and Password='" + txt_Password.Text + "'");


                if (table.Rows.Count == 1)
                {
                    this.Hide();
                    TerminalAdmin AdminTerminal = new TerminalAdmin();
                    AdminTerminal.Show();

                }
                else
                {
                    MetroFramework.MetroMessageBox.Show(this, "Invalid Username/Password please check your Username and Password and try again.", "Access Denied", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    txt_Password.Clear();
                }
            }
            else if (separator == 2)
            {

                Data getTable = new Data();
                DataTable table = getTable.GetData("select  UserName,Password from Admin_Table where UserName='" + txt_UserName.Text + "' and Password='" + txt_Password.Text + "'");

                if (table.Rows.Count == 1)
                {
                    Data getter = new Data();
                    DataTable dt = getter.GetData("select UserID from Admin_Table where UserName='" + txt_UserName.Text + "'");
                    MessageBox.Show(dt.Rows[0][0].ToString());
                    this.Hide();
                    Updating form = new Updating(dt.Rows[0][0].ToString(), txt_UserName.Text);
                    form.Show();

                }